Loom stopping and let-back mechanism



July 8, 1930. H. H. BURDETT LOOM STOPPING AND LET BACK MECHANISM 2 Sheets-Sheet 1 Filed Oct. 7, 1929 Fig.1.

a o as r c3 9 as Y ss- |nvenTon Hog-ace H. BurdeTT July 8, 1930. H. H. BURDETT LOOM STOPPING AND LET BACK MECHANISM Filed Oct. '7, 1929 2 Sheets-Sheet 2 lnvehTor. Horace H. Burdef'l' y/wmkw AH'ys.

Patented July 8, 1930 UNITED sures PATENT OFFICE HORACE H. BURDETT, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR '10 DRAPER COR- PORATION, OF HOPEDALE, MASsACfiUsETTs, A CORPORATION OF MAINE LQOM STOPPING AND LET-BACK MECHANISLI Application filed October ,7, 1929. Serial No. 397,765.

This invention relates to improvements in take-up mechanisms for looms and particularly to the means for releasing the clutch to permit let-back of the take-up roll upon de- 5 tection by the filling fork of failure of filling.

In usual constructions the clutch of the take-up mechanism is released upon detection by the filling fork of failure of fillingthrough the movement of the filling fork slide which '10 aotuates a bell crank lever pivotally mounted upon a controller rod to transmit motion through a link to the clutch-releasing lever. In order to insure proper disengagement of the clutch, careful'adjustments of the weft hammer and of the mechanisms for transmitting the force therefrom to the clutch shifting lever is required. Sometimes in the operation of the loom the clutch fails to disengage and. in endeavouring to overcome this diificulty improper adjustments are made which result in causing the feeler slide to engage its stop before the actuating cam for the weft hammer has reached its maximum position, thereby imposing a strain upon the arm 2.3 of the weft hammer which engages the cam. This is likely to result in injury or breakage of some part of the'weft hammer orof the slide. In otherinstances the adjustment is such as to permit too great a forward move- V 3 ment of the slide and this results in opening the clutch too far and imposing such force upon the mechanism which transmits motion from the slide to the clutch-actuating element as to vary the. adjustments thereof or bend 33 or break certain of the parts of the mot-iontransmitting mechanism.

One of the objects of the present invention is to provide yieldable means intermediate of the weft hammer actuating cam and the weft 4.0 hammer which will avoi'd breakage or injury to the wefthammer'or the slide.

- Afurther object of the invention is to provide mechanism through which the filling fork slide actuates the clutch-releasing lever 15 with yieldahle meanswhich will prevent undue strain upon such power transmitting mechanism. 4

A. further and very important object of the invention is to provide means for actuating 50 the clutch directly from the Weft hammer,

drawings and will'be particularly pointed out in the claims. 7

The present invention relates to improvements in take-up mechanisms of the general type illustrated in the patent to Rhoades No. 913,915 granted March 2, 1909, and the prior patent to Emery No. 64-8 903 granted May 1 1900, referred to therein. I

Inasmuch as this general type of mechanism'is well known in loom constructions, only a sufficient" portion of the loom is shown in the drawings to illustrate the embodiment of the present invention therein.

In the drawings:

Fig. 1 is a vertical sectionalview of a portion of the loom looklng toward the loom side and illustrating the present; invention as a1 plied to the take-up mechanism of a loom, and illustrating such portions of the usual loom structure as are necessarily associated there with; I i

Fig. 2 is a detail sectional view on line 2-2 Fig. 1, illustrating means for permitting the camengaging arm of the weft hammer to yield to unusual force;

Fig. 3 is a front elevation of the mechanism illustrated in Fig. 1;

. Fig. 4 is an enlarged detail view in longitudinal section, on line -i i 1, of the'link mechanism for controlling and actuating the clutch-shifting lever;

Fig. 5 is an enlarged detail view of a portion of the bell crank lever which is rotatably mounted upon the controller rod and trans mits motion from the feeler slide to the means for positioning the link through which the clutch-shifting lever is actuated; and,

Fig. 6 is a side view of the portion of the hell crank lever illustrated in Fig. 5.

The usual loom mechanism, which is illustrated in theaccompanying drawmga'comprises the loomside 1, the take-up stand 2,

which is mountedupon the usual cross girder, the controller rock shaft 3, the breast beam 4:, which'is mounted upon the loom side, the weft hammer 5,-which is pivotally. mounted I upon a shaft or stud 6,;and isactuated through an arm 7 having adjustably secured to its opposite end a shoe 8 which engages a cam 9 upon the camshaft v The usual filling fork slide 11 is slidably mounted in a suitable stand. secured to the breast beam and the filling fork 12 which is pivotallycsecuredto the rearend of the slide is provided with-a loop 13 adapted to be engagedxby a hook 14 upon the weft hammer-and actuated bythe vibratoryfmovement of the weft fork when the fillingfork is not swung -about its pivot by;

nalled in the bearing of a suitable bracket 18 mounted upon 'theloom side. The gearf1 6 is provided with a'c1utchface'19 which engages uponthe shaft 17. The slidable clutch meme tea a complementary clutchface20 'upon' a sliding clutch member ,21 which is feathered ber 21 is actuated by. aclutch-shifting lever 22 actuated by suitable mechanism controlled by the movement of the filling fork slide.

The mechanisms above described "may be and desirablyare of usual construction and usual meansmay also be provided to limit the let-back of the take-up rollupondetectlon of j 1 failure of filling by the filling fork.

' engagement of the loop of the filling fork. with the weft'hammer upon detectionof fa1l In'usual constructions the forward reciprocation of the'filling' fork slide, caused by the are of filling, actuates a bell crank lever which is pivotally'mounted upon thecontiOller shaft 3 to force downwardly a link 1 which is directly connected to the clutch-' shifting lever 22.

1 Under certain [circumstances above de scribed,'such as improper adjustment of the parts, the movement-of the weft hammer is unduly limited, or undue resistance is imposed upon the weft'hammer whichis likely 'to result in breakage of certaintparts of the power transmitting mechanism. In order to overcome this diflicultythe present invention contemplates theprovision of resilient means intermediate of the weft hammerand the cam by which it is actuated which will yield sufficiently to] avoid such injury or breakage;

,This is accomplished in] the construction illustratedinthekdrawings by forming the weft, hammer arm in twe sections-one of which isintegralfiwith the fulcrumed portion of the-weft hammer and extends downwardly fork slide.

tional positioning member is adjustably seand rearwardly therefrom, and is provided with a wldened end portion 28 having laterally ext-ending flanges 24 and 25 which embrace an arm 26 which is pivotally connected bya stud 27 to said integral portion and ex- .tendstherefrom over the actuating cam 9 and to which arm the shoe 8 is; adj ustably attached.- A spring, or preferably a plurality of springs 28 are interposed between the arm 26 and the flange 25 of the end portion of the integral arm of the weft hammer. i i

I By reason of this construction the arm 26 is permitted to yield if the weft hammer or the slide engages an obstruction which prevents further movement thereof before the high port-ion ofthe cam engages the shoe 8, or if too much resistance is imposed upon the'weft hammer by reason of too great movement of the movable clutch'member, or by reason of improper adjustment of thepower transmitting parts. Injury and breakage of the weft hammer arm or of the power transmitting mechanisms is thereby avoided. It will be obvious that this or equivalent means may be "imposed between the weft hammer and its actuating cam in'usualtypes of construction as well in thec'onstructions embodying other features of the invention"illustrated herein. The present invention also contemplates the provision of novel mechanism for releasing the clutch, more particularly comprising "means foractuating theclutch-shifting lever directly from the weft hammer, or some other continuously vibrating member. In the conlarged flanged'end whichis secured to a'bo'ss 30 upon the weft hammer and at its forward end with Ian oifsetertension 31 adapted to en 'gage'a shoulder 32 upon a link 33 which has an. offset lower end 34- pivotally connected to the clutch-shifting lever 22. 1

The offset extension 31 desirably is L- shaped and adjustably connected by 'bolt and slot connections to the end of the arm 29,

the contacting faces of the members desirably being serrated to provide a rigid interlocking engagement. a

The link33 has a pin 35 at'its upperend which engages slots 36 in-the bifurcated lower end 37 of the 'lowersection'38 of an extensible positioning "member, the upper end of'which is engaged and actuatedi by a 'jbell-crank lever which "is mounted upon "the controller rod and which is provided with an arm extending into the pathof the filling The upper section 39 of the seccured to' the 'lower'section by a bolt and slot connection 40' and 41. A transverse slot or recess. 12. is provided in the upper section '39 to receivea pin or cylindrical arm 136f the bell. crank, lever which is actuated by the of the positioning member adjacentitsend movement of the filling fork slide. A spiral spring 44, seated a t 'its'lower end upon the bottom of the recess and-at its upper end engagingthe pin 43, permits a yielding movement-between the pin and positioning memberif too great resistance would be otherwise imposed upon the pin. An adj usting screw '45 thread ed into the upper end ofthe positioning 'memb'er and extending into engagement with thepin 43, provides means for accurately adjusting the relative positions oftheupper end of the member aiid the bell crank lever. I Q

'lhe upper end of the section 39 of the positioning member is provided with a lateral en'tension 46 which is pivotally connected by a pin 47 tothe ear .48 ofa bracket 49 which is secured to the breast beam; By reason of this construction the downward movement of the positioning member, caused by the bell crank lever, swings the lower end of the member laterally about the pivot'4 7, thereby moving the upper end of the link 33 from normafposition, illustrated in dotted lines i113, into full line position shown in said figure, and positioning'the shoulder 32 of the link 33 in the path of the offset end 31 of-the weft hammer extension 29, so thatfcontinned movement of the weft hammer will force the link 33 downwardly and consequently actuate the [clutch-shifting lever 22 to release the clutch.

In the present construction the bell crank lever, which actuates the sectionalpositioning ember, is of improved construction adapted to permit accurate adjustment. It is formed in two parts, one of which comprises abearing or boss 50 which is rotatably mounted upon thecontroller'rod 3 and is provided with an upwardly'extending arm 51 having av slot 52 therein, the other arm of the bell cran'kbeing the pin43 which enters the slot in the upper section 39 of the positioning member as above described. The other member of the bell crank comprises an 211111 53 which-is mounted upon the eontreller shait 3 and extends upwardly in engagement with the arm 51 ofthe bell crank member and'has at'its upper end a lateral extension or pin 54 which lies in the path of the forwardend of the filling fork slide. i;

' The arm 53 is secured to the arm 51 of the bell crank member by a bolt 55 or machine screw which extends through the slot 52 and is adapted to permit suitable adjustments between the arm 53 and the arm 51- of the bell crank member: By reason of this adjustment and also by the adjustmentof the screw 45 in the end of. the positioning member, a

very accurate positioning of the parts of-the mechanism for controlling the link member 33 is provided. i

In the operation of the machine, therefore,

when failure of filling is detected by the fillingfork, the loop of the filling fork is engaged by the weft hammer and the filling fork slide moved forwardly, thereby engaging and actuating the arm 53 of the bell crank lever which is mounted upon the com troller shaft 3. The rocking movement of the bell crank causes the pin 43 to force the sectional positioning member downwardly, thereby swinging its lower end laterallyand moving the upperend of the link 33laterally until its shoulder'32 is positionedin the path of the offsetendportion3l of the weft hammer extension 29. I vi By reason of this construction very little force is required to betransmitted by the movement of the filling fork slide-to position the shoulder of-the link 33 in the path of the weft hammer extension. ,Consequent'ly, no sufficient force is imposed upon the adjust ing mechanisms to interfere with-theproper maintenance of their adjustments.

Continued movement of the wefthammer after the shoulder ofthe'link 33 has been placed in the path of the we'ft'hammer extension causes the link 33 to be positively depressed by'the movement of the weftihammer to actuate the clutch-shifting mechanism. Consequently, proper release of the clutch members will be insured, notwithstanding the force required to disengage the teeth of the clutch produced by the .tension:0f .tl1e goods when such. heavy materials, as canvas or duck are being woven. Ii

By reason of the present invention" therefore, interference with the free action of the fillingrfork slide is substantially avoided, as well as the application of great resistance to the arm of the 1 weft hammer which engages the filling fork Positive .means are provided for actuating the clutch-shifting lever directly' from the weft hammer, or some other continuously vibratingmember of the loom which may be employed in place thereof. 5

By reason of the yielding connection be tween the bell crank lever, which is pivotally mounted upon theicontroller rod and the positioning member. which is operated by it, the danger ofvarying adjustments or inmultiplicity of adjustments proper coordi nation of themovements of the various parts may be accurately made and maintained so that the objectionable features of the clutchactuating mechanism heretofore described may be readily and entirely overcome;

Having thus described-the invention, what is claimed asnew, anddesired to be secured by Letters Patent, is:

1. Mechanism for actuating the clutchshifting means of the let-backmechanism of aloom comprising a positively andcontinuously actuated vibratory memberand means acting. upondetection, by the filling fork, of failure of filling to effect a direct uring' moving parts is avoided, andby'the conjnedtion cibetweenirsaid vibrating member andsaid clutch-shif'ting means operable vto disengage the members 'of the clutch. 2.Mechanism;for actuating the clutchs shifting means of the, let-back mechanism of a loom vcomprising anexite'nsion of the weft shifting means of the let-back mechanism of a loom comprising-an lextension of the weft hammer and means actuated by the moveinent of the filling fork slide upon detection of fai lure oflfilling to. effect a direct con-nection between said weft hammer'extension and said clutcheshiftingfmeansoperable to disengage the members of the 'clutch,1and yieldable means intermediate of the filling fork slide and'fthe connecting means actuated thereby operable to prevent. injury to the clutch-operating rmechani'sm "11- on excessive movement of the filling fork "s ide or by excessive gripping of :the clutch:

, 4. -Mechanism for actuating the. clutch shifting means of the let-back irneclranismrof a loom comprisingzan extension "of the jweft hammerandmean'sactuated by themjovement of the filling fork slide upon detection of failure of filling to effect nadirectcOnnection between said weft hammer extensionand said sclntoh shifting meanstopera-ble :to disengage the members :of the =clutch,:and 'y-ieldable -meansintermediate of the weft hammer and its actuating camacting toprevent :inju'ry to V a the weft hammer'orithe mechanisms actuated thereby; 1 1 1 u a 5.; In a 100m comprising v a weft hammer, an actuating camcthe-refonra filling fork slide havinghifilling:iforkr'to engage said weft hammer upon detection of failure of' fil1ing,;and letebackvmechanism having a clutch shifting'lever, clutch-releasing mechanism' comprising a forward extension I of said weft hammer, a link piv'otall! connected atlits-lower end to said clutch-shifting lever having a lateral shoulder-to; engage said weft hammer extension, but "normally 'lying out "of the path :thereof, means connected 'to the upper :end ofsaidi link operable by said filling forklslide upon-actuation by-said weft hammer to move the upper end of the link laterally and thereby to positionsaidshouldersinrtlie path of said-weft hammer extension, whereby continued: movement of "said weft hammer will positivelyactuate said clutchshi'fting 'leverto disengage-the clutch. x 6.: lna loomcomprising a weft hammer, an

actuating cam :there'for, afilling fork slide 'h 'aving'a filling fork to engage said weft ham mer: upon detection of failure of filling, and

leteback mechanismjhaving -.a clutch and a clutch-shifting lever, clutch-releasing mechanism comprising :a forward extension of said weft hammer, vlink pivotally eonnected: at its lower end to said clutchshifti-n'g {lever having a lateral shouldc'r teen-gage said weft hammer extension, but normally lying out-of the path thereof, a positioning member pivotally (connected to the upper end of' said link, yieldable means intenmediateof the upper end of said positioning member and said filling fork slide operable upon actuation of said slide by said weft hammer to swing the upper end ofthe link laterally and thereby position its shoulder in the path of said weft hammer extension, whereby continued movement of the weft hammer Will positively actuate the clutch-releasing lever to disengage sai clutch. a

7. "In a loom comprising a weft hammer,

. anactuating camtherefor, a filling forkslide havinga filling fork to engage said weft hammer-upondeteotion of failure of filling, and let-back mechanism having a clutch and a clutch shifting lever, clutch-releasing mec hanism comprising a forward extension of said weft hammer, a link plvotally connected at its lower ,end to 'said' clutch-shifting lever having a lateral shoulder to engage said weft hammer extensiornbut normally lying out of the-path thereof, a positioning member pivotally connected to said linkand having at its upper end a lateral extension, means pivotally connecting said extensionto a stationary part ofthe loom, a bell crank lever pivotally mounted upon said-controller rod having an arm extending into the path of the filling fork slide, and an arm-engaging the upper endof said positioningmember operable by said filling fork slide upon actuation by said weft hammer to cause said positioning memberfito swing the upper end "of said link laterally, and thereby position its shoulder in the path of the weft hammer extension, whereby continued movement of 'saidwe'ft hammer will positively v actuate said "clutch-shifting lever to disengage the clutch.

-8. Ina loom comprising aweft hammer, an actuating cam therefor, a filling fork slide having a filling fork to engage said weft hammerupon detection of failure of filling, and let-back mechanism having a clutch and a clutch-shifting lever, clutch-releasing mechanism comprising a forward extension of said weft hammer, a link pivotally connected'at its lower end to said clutch-shifting lever having a lateral shoulder to engage said weft hammer extension, but normally lying out of the path thereof, a positioning member pivotally connected at its lowerend to saidlink and having a recessed upper end provided with 'a lateral extension, means pivotally connecting said lateral extension fo a stationary part of the-loom, a bell crank .le'ver pivotally mounted upon saidcontroller rod having an arm extending in the path of the filling fork slide,'and an arm extending into the recess in the upper end of said lever, a spring in said recess beneath said arm, and an adjusting screw in the end of said lever engaging said arm providing an adjustable and yielding connection between said lever and said positioning member acting to prevent injury to the mechanism upon excessive movement of said filling fork slide, and operable upon actuating of said filling fork slide by said weft hammer to swing the upper end of said positioning member laterally and thereby position said shoulder in the path of the weft hammer extension, whereby continued movement of said weft hammer Will positively actuate said clutchshifting lever to disengage the clutch.

9. In a loom comprising a weft hammer, an actuating cam therefor, a filling fork slide having a filling fork to engage said weft hammer upon detection of failure of filling, and let-back mechanism having; a clutch and a clutch-shifting lever, clutch-releasing mechanism comprising a forward extension of said weft hammer, a link pivotally connected at its lower end to said clutch-shifting lever having a lateral shoulder to engage said Weft hammer extension, but normally lying out of the path thereof, a positioning member pivotally connected at its lower end to the upper end of said link and having at its upper end a lateral extension pivotally connected to a stationary part of the loom, a bell crank lever comprising a sleeve rotatably mounted upon said controller rod having an arm adjustably secured to a co-operating arm also mounted upon said controller rod and extending into the path of the filling fork slide and a forwardly extending pin engaging the upper end of said link operable upon actuation of said bell crank lever by v HORACE H. BURDETT.

the filling fork slide to swing the upper end of said link laterally and thereby to position said shoulder in the path of the weft hammer extension, whereby continued movement of said Weft hammer will positively actuate said clutch-shifting lever to disengage the clutch.

10. A loom comprisinga weft hammer actuating cam, a weft hammer having a rear wardly extending arm formed in relatively yieldable sections engaging said cam and a forward extension, a filling fork slide having a filling fork to engage said weft hammer upon detection of failure of filling, let-back mechanism having a clutch-shifting lever,

means for actuating said clutch-shifting lever including a link pivotally'connected at its lower end to said clutch-shifting lever and provided with a shoulder to engage the weft hammer extension, but normally lying out of the path thereof, and means operable by said filling fork slide when actuated by said weft hammer to move the upper end of said 

